Made in the USA, Nest Blocker™ wall mount commercial exterior sprinkler head protectors are crafted from heavy-duty galvaneeled steel. They're engineered specifically to keep birds, especially Cliff Swallows (mud and barn swallows), from nesting on exterior sprinkler heads, which blocks water flow and causes corrosion. Installing the Nest Blocker™ is quick and easy, taking only minutes. Available in both a black and a white powder coat finish, the Nest Blocker™ is code compliant to keep sprinkler heads visible and unobstructed for inspection.